How do I get texture on my porch slab top? Want stamped 'crete but get Z-fighting at walls

[GeneDavis]

See the pic here.

 

 

A small building with a thickened-edge slab (monoslab with footings at perimeter walls) is modeled, the porch walls are railings and invisible, the footings 16 wide 20 deep making the thickened edges 24 high.  The only way I could think of to do a textured floor surface was to add a finish layer on top, which I did at 1" thickness and made the material stamped 'crete.

 

But look.  No texture at the 16-wide edges where the "footings" are under.

 

What to do?

[GaryOhmer]

why don't you lower the floor 1" and put a 1" slab on top ?

[GeneDavis]

54 minutes ago, GaryOhmer said:

why don't you lower the floor 1" and put a 1" slab on top ?

I can't seem to be able to do that.

 

And why is this needed for such a common need for texture.  Stamped 'crete surfaces are done all the time on porches.

[GaryOhmer]

use a porch room and it'll work

[GaryOhmer]

[DG1949]

Polyline Solid?

[GeneDavis]

Thanks, Gary.  Porch room did it.